U.S. patent application number 13/092835 was filed with the patent office on 2012-10-25 for methods and apparatus for timing synchronization for peer to peer devices operating in wwan spectrum.
This patent application is currently assigned to QUALCOMM Incorporated. Invention is credited to Junyi Li, Anand Muralidhar, Shailesh Patil, Thomas J. Richardson, Hua Wang, Xinzhou Wu.
Application Number | 20120269178 13/092835 |
Document ID | / |
Family ID | 46022723 |
Filed Date | 2012-10-25 |
United States Patent
Application |
20120269178 |
Kind Code |
A1 |
Li; Junyi ; et al. |
October 25, 2012 |
METHODS AND APPARATUS FOR TIMING SYNCHRONIZATION FOR PEER TO PEER
DEVICES OPERATING IN WWAN SPECTRUM
Abstract
A method, an apparatus, and a computer program product are
provided in which a clock timing is determined for utilizing
resources including peer-to-peer resources based on a WWAN downlink
receive timing and a WWAN uplink transmit timing. In addition, the
clock timing is utilized for peer-to-peer communication with the
peer-to-peer resources.
Inventors: |
Li; Junyi; (Chester, NJ)
; Wang; Hua; (Bridgewater, NJ) ; Patil;
Shailesh; (Bridgewater, NJ) ; Wu; Xinzhou;
(Monmouth Junction, NJ) ; Richardson; Thomas J.;
(South Orange, NJ) ; Muralidhar; Anand;
(Champaign, NJ) |
Assignee: |
QUALCOMM Incorporated
San Diego
CA
|
Family ID: |
46022723 |
Appl. No.: |
13/092835 |
Filed: |
April 22, 2011 |
Current U.S.
Class: |
370/336 ;
370/329 |
Current CPC
Class: |
H04W 76/10 20180201;
H04W 56/0045 20130101 |
Class at
Publication: |
370/336 ;
370/329 |
International
Class: |
H04W 72/04 20090101
H04W072/04; H04W 56/00 20090101 H04W056/00 |
Claims
1. A method of wireless communication, comprising: determining a
clock timing for utilizing resources comprising peer-to-peer
resources based on a wireless wide area network (WWAN) downlink
receive timing and a WWAN uplink transmit timing; and utilizing the
clock timing for peer-to-peer communication with the peer-to-peer
resources.
2. The method of claim 1, wherein the determining the clock timing
comprises averaging the WWAN downlink receive timing and the WWAN
uplink transmit timing.
3. The method of claim 1, further comprising: receiving a timing
synchronization signal from a base station; and determining the
WWAN downlink receive timing based on the received timing
synchronization signal.
4. The method of claim 1, further comprising: receiving a timing
advance from a base station; and determining the WWAN uplink
transmit timing based on the received timing advance.
5. The method of claim 1, wherein the resources further comprise
WWAN resources frequency division multiplexed with the peer-to-peer
resources.
6. The method of claim 1, wherein the resources further comprise
WWAN resources adjacent to the peer-to-peer resources, and the
method further comprises: receiving a timing advance from a base
station; and abstaining from using the peer-to-peer resources for
two time periods based on the timing advance, each time period of
the two time periods being adjacent to the WWAN resources.
7. The method of claim 6, wherein said each time period is half of
the timing advance.
8. The method of claim 6, wherein the two time periods comprise a
first time period and a second time period, the first time period
being a time period during which other wireless devices receive
signals from the base station and the second time period being a
time period during which other wireless devices transmit signals to
the base station.
9. The method of claim 8, wherein the first time period is equal to
the WWAN downlink receive timing and the second time period is
equal to the WWAN uplink transmit timing.
10. The method of claim 1, further comprising broadcasting the
clock timing.
11. An apparatus for wireless communication, comprising: means for
determining a clock timing for utilizing resources comprising
peer-to-peer resources based on a wireless wide area network (WWAN)
downlink receive timing and a WWAN uplink transmit timing; and
means for utilizing the clock timing for peer-to-peer communication
with the peer-to-peer resources.
12. The apparatus of claim 11, wherein the means for determining
the clock timing averages the WWAN downlink receive timing and the
WWAN uplink transmit timing.
13. The apparatus of claim 11, further comprising: means for
receiving a timing synchronization signal from a base station; and
means for determining the WWAN downlink receive timing based on the
received timing synchronization signal.
14. The apparatus of claim 11, further comprising: means for
receiving a timing advance from a base station; and means for
determining the WWAN uplink transmit timing based on the received
timing advance.
15. The apparatus of claim 11, wherein the resources further
comprise WWAN resources frequency division multiplexed with the
peer-to-peer resources.
16. The apparatus of claim 11, wherein the resources further
comprise WWAN resources adjacent to the peer-to-peer resources, and
the apparatus further comprises: means for receiving a timing
advance from a base station; and means for abstaining from using
the peer-to-peer resources for two time periods based on the timing
advance, each time period of the two time periods being adjacent to
the WWAN resources.
17. The apparatus of claim 16, wherein said each time period is
half of the timing advance.
18. The apparatus of claim 16, wherein the two time periods
comprise a first time period and a second time period, the first
time period being a time period during which other wireless devices
receive signals from the base station and the second time period
being a time period during which other wireless devices transmit
signals to the base station.
19. The apparatus of claim 18, wherein the first time period is
equal to the WWAN downlink receive timing and the second time
period is equal to the WWAN uplink transmit timing.
20. The apparatus of claim 11, further comprising means for
broadcasting the clock timing.
21. An apparatus for wireless communication, comprising: a
processing system configured to: determine a clock timing for
utilizing resources comprising peer-to-peer resources based on a
wireless wide area network (WWAN) downlink receive timing and a
WWAN uplink transmit timing; and utilize the clock timing for
peer-to-peer communication with the peer-to-peer resources.
22. The apparatus of claim 21, wherein to determine the clock
timing, the processing system is configured to average the WWAN
downlink receive timing and the WWAN uplink transmit timing.
23. The apparatus of claim 21, wherein the processing system is
further configured to: receive a timing synchronization signal from
a base station; and determine the WWAN downlink receive timing
based on the received timing synchronization signal.
24. The apparatus of claim 21, wherein the processing system is
further configured to: receive a timing advance from a base
station; and determine the WWAN uplink transmit timing based on the
received timing advance.
25. The apparatus of claim 21, wherein the resources further
comprise WWAN resources frequency division multiplexed with the
peer-to-peer resources.
26. The apparatus of claim 21, wherein the resources further
comprise WWAN resources adjacent to the peer-to-peer resources, and
the processing system is further configured to: receive a timing
advance from a base station; and abstain from using the
peer-to-peer resources for two time periods based on the timing
advance, each time period of the two time periods being adjacent to
the WWAN resources.
27. The apparatus of claim 26, wherein said each time period is
half of the timing advance.
28. The apparatus of claim 26, wherein the two time periods
comprise a first time period and a second time period, the first
time period being a time period during which other wireless devices
receive signals from the base station and the second time period
being a time period during which other wireless devices transmit
signals to the base station.
29. The apparatus of claim 28, wherein the first time period is
equal to the WWAN downlink receive timing and the second time
period is equal to the WWAN uplink transmit timing.
30. The apparatus of claim 21, wherein the processing system is
further configured to broadcast the clock timing.
31. A computer program product in a wireless device, comprising: a
computer-readable medium comprising code for: determining a clock
timing for utilizing resources comprising peer-to-peer resources
based on a wireless wide area network (WWAN) downlink receive
timing and a WWAN uplink transmit timing; and utilizing the clock
timing for peer-to-peer communication with the peer-to-peer
resources.
32. The computer program product of claim 31, wherein the code for
determining the clock timing averages the WWAN downlink receive
timing and the WWAN uplink transmit timing.
33. The computer program product of claim 31, wherein the
computer-readable medium further comprises code for: receiving a
timing synchronization signal from a base station; and determining
the WWAN downlink receive timing based on the received timing
synchronization signal.
34. The computer program product of claim 31, wherein the
computer-readable medium further comprises code for: receiving a
timing advance from a base station; and determining the WWAN uplink
transmit timing based on the received timing advance.
35. The computer program product of claim 31, wherein the resources
further comprise WWAN resources frequency division multiplexed with
the peer-to-peer resources.
36. The computer program product of claim 31, wherein the resources
further comprise WWAN resources adjacent to the peer-to-peer
resources, and the computer-readable medium further comprises code
for: receiving a timing advance from a base station; and abstaining
from using the peer-to-peer resources for two time periods based on
the timing advance, each time period of the two time periods being
adjacent to the WWAN resources.
37. The computer program product of claim 36, wherein said each
time period is half of the timing advance.
38. The computer program product of claim 36, wherein the two time
periods comprise a first time period and a second time period, the
first time period being a time period during which other wireless
devices receive signals from the base station and the second time
period being a time period during which other wireless devices
transmit signals to the base station.
39. The computer program product of claim 38, wherein the first
time period is equal to the WWAN downlink receive timing and the
second time period is equal to the WWAN uplink transmit timing.
40. The computer program product of claim 31, wherein the
computer-readable medium further comprises code for broadcasting
the clock timing.
Description
BACKGROUND
[0001] 1. Field
[0002] The present disclosure relates generally to communication
systems, and more particularly, to timing synchronization for peer
to peer devices operating in wireless wide area network (WWAN)
spectrum.
[0003] 2. Background
[0004] In a WWAN, all communication between wireless devices goes
through the uplink and downlink channels between the wireless
devices and the serving base station(s). When two communicating
wireless devices are in the vicinity of each other, they can
communicate directly without going through a base station. Such
direct peer-to-peer communication can enable new types of services
and/or reduce the traffic load on the base station.
[0005] To avoid interference between peer-to-peer communication and
WWAN communication, peer-to-peer communication frames/resources and
WWAN communication frames/resources are orthogonalized in time. As
such, wireless devices participating in peer-to-peer communication
need to be synchronized with each other in their peer-to-peer
communication frames. As such, a need exists for synchronizing
peer-to-peer communication in a synchronized Long Term Evolution
(LTE) network in which evolved Node Bs (eNodeBs) are
synchronized.
SUMMARY
[0006] In an aspect of the disclosure, a method, an apparatus, and
a computer program product are provided in which a clock timing is
determined for utilizing resources including peer-to-peer resources
based on a WWAN downlink receive timing and a WWAN uplink transmit
timing. In addition, the clock timing is utilized for peer-to-peer
communication with the peer-to-peer resources.
BRIEF DESCRIPTION OF THE DRAWINGS
[0007] FIG. 1 is a diagram illustrating an example of a hardware
implementation for an apparatus employing a processing system.
[0008] FIG. 2 is a diagram of a wireless peer-to-peer
communications system.
[0009] FIG. 3 is a diagram illustrating peer-to-peer communication
resources and WWAN communication resources orthogonalized in
time.
[0010] FIG. 4 is a diagram illustrating a downlink receive timing
and a timing advance.
[0011] FIG. 5 is a diagram illustrating a peer-to-peer
communication timing.
[0012] FIG. 6 is a flow chart of a method of wireless
communication.
[0013] FIG. 7 is a flow chart of another method of wireless
communication.
[0014] FIG. 8 is a conceptual block diagram illustrating the
functionality of an exemplary apparatus.
DETAILED DESCRIPTION
[0015] The detailed description set forth below in connection with
the appended drawings is intended as a description of various
configurations and is not intended to represent the only
configurations in which the concepts described herein may be
practiced. The detailed description includes specific details for
the purpose of providing a thorough understanding of various
concepts. However, it will be apparent to those skilled in the art
that these concepts may be practiced without these specific
details. In some instances, well known structures and components
are shown in block diagram form in order to avoid obscuring such
concepts.
[0016] Several aspects of communication systems will now be
presented with reference to various apparatus and methods. These
apparatus and methods will be described in the following detailed
description and illustrated in the accompanying drawing by various
blocks, modules, components, circuits, steps, processes,
algorithms, etc. (collectively referred to as "elements"). These
elements may be implemented using electronic hardware, computer
software, or any combination thereof. Whether such elements are
implemented as hardware or software depends upon the particular
application and design constraints imposed on the overall
system.
[0017] By way of example, an element, or any portion of an element,
or any combination of elements may be implemented with a
"processing system" that includes one or more processors. Examples
of processors include microprocessors, microcontrollers, digital
signal processors (DSPs), field programmable gate arrays (FPGAs),
programmable logic devices (PLDs), state machines, gated logic,
discrete hardware circuits, and other suitable hardware configured
to perform the various functionality described throughout this
disclosure. One or more processors in the processing system may
execute software. Software shall be construed broadly to mean
instructions, instruction sets, code, code segments, program code,
programs, subprograms, software modules, applications, software
applications, software packages, routines, subroutines, objects,
executables, threads of execution, procedures, functions, etc.,
whether referred to as software, firmware, middleware, microcode,
hardware description language, or otherwise. The software may
reside on a computer-readable medium. The computer-readable medium
may be a non-transitory computer-readable medium. A non-transitory
computer-readable medium include, by way of example, a magnetic
storage device (e.g., hard disk, floppy disk, magnetic strip), an
optical disk (e.g., compact disk (CD), digital versatile disk
(DVD)), a smart card, a flash memory device (e.g., card, stick, key
drive), random access memory (RAM), read only memory (ROM),
programmable ROM (PROM), erasable PROM (EPROM), electrically
erasable PROM (EEPROM), a register, a removable disk, and any other
suitable medium for storing software and/or instructions that may
be accessed and read by a computer. The computer-readable medium
may be resident in the processing system, external to the
processing system, or distributed across multiple entities
including the processing system. The computer-readable medium may
be embodied in a computer-program product. By way of example, a
computer-program product may include a computer-readable medium in
packaging materials.
[0018] Accordingly, in one or more exemplary embodiments, the
functions described may be implemented in hardware, software,
firmware, or any combination thereof. If implemented in software,
the functions may be stored on or encoded as one or more
instructions or code on a computer-readable medium.
Computer-readable media includes computer storage media. Storage
media may be any available media that can be accessed by a
computer. By way of example, and not limitation, such
computer-readable media can comprise RAM, ROM, EEPROM, CD-ROM or
other optical disk storage, magnetic disk storage or other magnetic
storage devices, or any other medium that can be used to carry or
store desired program code in the form of instructions or data
structures and that can be accessed by a computer. Disk and disc,
as used herein, includes compact disc (CD), laser disc, optical
disc, digital versatile disc (DVD), floppy disk and Blu-ray disc
where disks usually reproduce data magnetically, while discs
reproduce data optically with lasers. Combinations of the above
should also be included within the scope of computer-readable
media. Those skilled in the art will recognize how best to
implement the described functionality presented throughout this
disclosure depending on the particular application and the overall
design constraints imposed on the overall system.
[0019] FIG. 1 is a conceptual diagram illustrating an example of a
hardware implementation for an apparatus 100 employing a processing
system 114. The processing system 114 may be implemented with a bus
architecture, represented generally by the bus 102. The bus 102 may
include any number of interconnecting buses and bridges depending
on the specific application of the processing system 114 and the
overall design constraints. The bus 102 links together various
circuits including one or more processors and/or hardware modules,
represented generally by the processor 104, and computer-readable
media, represented generally by the computer-readable medium 106.
The bus 102 may also link various other circuits such as timing
sources, peripherals, voltage regulators, and power management
circuits, which are well known in the art, and therefore, will not
be described any further. A bus interface 108 provides an interface
between the bus 102 and a transceiver 110. The transceiver 110
provides a means for communicating with various other apparatuses
over a transmission medium.
[0020] The processor 104 is responsible for managing the bus 102
and general processing, including the execution of software stored
on the computer-readable medium 106. The software, when executed by
the processor 104, causes the processing system 114 to perform the
various functions described infra for any particular apparatus. The
computer-readable medium 106 may also be used for storing data that
is manipulated by the processor 104 when executing software.
[0021] FIG. 2 is a drawing of an exemplary peer-to-peer
communications system 200. The peer-to-peer communications system
200 includes a plurality of wireless devices 206, 208, 210, 212.
The peer-to-peer communications system 200 may overlap with a
cellular communications system, such as for example, a WWAN. Some
of the wireless devices 206, 208, 210, 212 may communicate together
in peer-to-peer communication, some may communicate with the eNodeB
204, and some may do both. For example, as shown in FIG. 2, the
wireless devices 206, 208 are in peer-to-peer communication and the
wireless devices 210, 212 are in peer-to-peer communication. The
wireless device 212 is also communicating with the eNodeB 204.
[0022] The wireless device may alternatively be referred to by
those skilled in the art as user equipment (UE), a mobile station,
a subscriber station, a mobile unit, a subscriber unit, a wireless
unit, a wireless node, a remote unit, a mobile device, a wireless
communication device, a remote device, a mobile subscriber station,
an access terminal, a mobile terminal, a wireless terminal, a
remote terminal, a handset, a user agent, a mobile client, a
client, or some other suitable terminology. The base station may
alternatively be referred to by those skilled in the art as an
access point, a base transceiver station, a radio base station, a
radio transceiver, a transceiver function, a basic service set
(BSS), an extended service set (ESS), a Node B, an evolved Node B,
or some other suitable terminology.
[0023] The exemplary methods and apparatuses discussed infra are
applicable to any of a variety of wireless peer-to-peer
communications systems, such as for example, a wireless
peer-to-peer communication system based on FlashLinQ, WiMedia,
Bluetooth, ZigBee, or Wi-Fi based on the IEEE 802.11 standard. To
simplify the discussion, the exemplary methods and apparatus are
discussed within the context of FlashLinQ. However, one of ordinary
skill in the art would understand that the exemplary methods and
apparatuses are applicable more generally to a variety of other
wireless peer-to-peer communication systems.
[0024] FIG. 3 is a diagram 300 illustrating peer-to-peer
communication resources and WWAN communication resources
orthogonalized in time. As shown in FIG. 3, the WWAN resources 302
and the peer-to-peer (P2P) resources 304 may be orthogonalized in
time so that interference between WWAN communication and
peer-to-peer communication can be avoided.
[0025] FIG. 4 is a diagram 400 illustrating a downlink receive
timing and a timing advance. In a synchronized LTE network, a UE
uses different timing for uplink and downlink communications with
the associated eNodeB. The downlink symbol timing 412 as received
by the UE is delayed by a propagation delay T.sub.p from the
downlink symbol timing 410 at the eNodeB. Uplink orthogonality is
maintained by ensuring that transmissions from UEs are time aligned
at the receiver of the eNodeB. Uplink orthogonality avoids
intra-cell interference occurring between UEs assigned to transmit
in consecutive subframes and between UEs transmitting on adjacent
subcarriers. Time alignment is achieved by the UE applying a timing
advance of 2T.sub.p with respect to the downlink symbol timing 412
as received at the UE such that the uplink transmitted symbol
timing 414 for the UE is T.sub.p earlier than the uplink symbol
timing 416 as received by the eNodeB.
[0026] FIG. 5 is a diagram 500 for illustrating an exemplary method
for determining a peer-to-peer communication timing. As shown in
FIG. 5, the downlink symbol timing 512 as received by the UE is
delayed by a propagation delay T.sub.d from the downlink symbol
timing 510 at the eNodeB. Time alignment for maintaining uplink
orthogonality is achieved by the UE applying a timing advance of
T.sub.a with respect to the downlink symbol timing 512 as received
at the UE such that the uplink transmitted symbol timing 514 for
the UE is T.sub.u earlier than the downlink symbol timing 510 at
the eNodeB. The uplink transmit timing T.sub.u is equal to the
difference between the timing advance T.sub.a and the downlink
receive timing T.sub.d. The peer-to-peer communication timing 516
is determined by an offset T.sub.P2P with respect to the downlink
symbol timing 510 at the eNodeB. The offset T.sub.P2P is an average
of the uplink transmit timing T.sub.u and the downlink receive
timing T.sub.d. The relationship between the downlink receive
timing T.sub.d, the timing advance T.sub.a, the uplink transmit
timing T.sub.u, and the offset T.sub.P2P are as follows:
T.sub.u=T.sub.a-T.sub.d (Eq. 1)
T.sub.P2P=(T.sub.u+T.sub.d)/2 (Eq. 2)
The peer-to-peer communication timing 516 with the offset T.sub.P2P
with respect to the downlink symbol timing 510 at the eNodeB
enables uniform peer-to-peer timing for peer UEs in a geographical
neighborhood while minimizing adjustments with respect to the
propagation delay from/to the eNodeB.
[0027] According to the exemplary method, a UE determines the
peer-to-peer communication timing (i.e., clock timing) 516 for
utilizing the peer-to-peer resources 518 based on a WWAN downlink
receive timing T.sub.d and a WWAN uplink transmit timing T.sub.u.
The UE utilizes the clock timing 516 for peer-to-peer communication
with the peer-to-peer resources 518. The UE determines the clock
timing 516 by averaging the WWAN downlink receive timing T.sub.d
and the WWAN uplink transmit timing T.sub.u (see Eq. 2). The UE
determines the WWAN downlink receive timing T.sub.d based on a
timing synchronization signal received from the eNodeB. The timing
synchronization signal may be a primary synchronization signal
(PSS) or a secondary synchronization signal (SSS). The UE receives
the timing advance T.sub.a from the eNodeB and determines the WWAN
uplink transmit timing T.sub.u based on the timing advance T.sub.a
(see Eq. 1). Once the UE determines the peer-to-peer communication
timing 516, the UE may broadcast the peer-to-peer communication
timing 516 periodically in a secondary timing channel so that peer
UEs that do not have an active uplink and downlink connection with
the eNodeB can monitor the second timing channel and adopt the
received timing information for peer-to-peer communication.
[0028] As shown in FIG. 5, the resources 516 may include the WWAN
resources 520, 522 adjacent to the peer-to-peer resources 518.
Based on the timing advance T.sub.a, the UE may abstain or refrain
from using portions of the peer-to-peer resources 518. That is, the
UE may abstain from using a first time period TP.sub.1 adjacent to
the WWAN resources 520 and a second time period TP.sub.2 adjacent
to the WWAN resources 522. The first time period TP.sub.1 is a time
period during which other UEs receive signals from the eNodeB and
the second time period TP.sub.2 is a time period during which other
UEs transmit signals to the eNodeB. In a first configuration, the
first time period TP.sub.1 and the second time period TP.sub.2 are
each equal to half of the timing advance T.sub.a, such as when the
timing advance T.sub.a is equal to twice the downlink receive
timing T.sub.d. In a second configuration, the first time period
TP.sub.1 is equal to the downlink receive timing T.sub.d and the
second time period TP.sub.2 is equal to the uplink transmit timing
T.sub.u, such as when the timing advance T.sub.a is not equal to
twice the downlink receive timing T.sub.d.
[0029] FIG. 6 is a flow chart 600 of an exemplary method. The
method is performed by a UE. As shown in FIG. 6, a UE receives a
timing synchronization signal from a base station (602). The UE
determines a WWAN downlink receive timing based on the received
timing synchronization signal (604). The UE receives a timing
advance from a base station (606). The UE determines a WWAN uplink
transmit timing based on the received timing advance (608). The UE
then determines a clock timing for utilizing resources including
peer-to-peer resources based on the WWAN downlink receive timing
and the WWAN uplink transmit timing (610). The UE utilizes the
clock timing for peer-to-peer communication with the peer-to-peer
resources (612). The UE may broadcast the determined clock timing
(614). The UE may determine the clock timing by averaging the WWAN
downlink receive timing and the WWAN uplink transmit timing. The
resources may further include WWAN resources frequency division
multiplexed with the peer-to-peer resources.
[0030] FIG. 7 is a flow chart 700 of another exemplary method. The
method is performed by a UE. The resources may further include WWAN
resources adjacent to the peer-to-peer resources. As shown in FIG.
7, the UE receives a timing advance from a base station (702). The
UE determines a clock timing for utilizing resources including
peer-to-peer resources based on a WWAN downlink receive timing and
a WWAN uplink transmit timing (704). The WWAN uplink transmit
timing is determined based on the timing advance (704). The UE
utilizes the clock timing for peer-to-peer communication with the
peer-to-peer resources (706). The UE abstains from using the
peer-to-peer resources for two time periods based on the timing
advance (708). Each time period of the two time periods is adjacent
to the WWAN resources (708). Each time period may be half of the
timing advance. The two time periods may include a first time
period and a second time period. The first time period is a time
period during which other wireless devices (i.e., UEs) receive
signals from the base station and the second time period is a time
period during which other wireless devices transmit signals to the
base station. The first time period may be equal to the WWAN
downlink receive timing and the second time period may be equal to
the WWAN uplink transmit timing.
[0031] FIG. 8 is a conceptual block diagram 800 illustrating the
functionality of an exemplary apparatus 100. The exemplary
apparatus 100 is a UE. The apparatus 100 includes a module 802 that
determines a clock timing for utilizing resources including
peer-to-peer resources based on a WWAN downlink receive timing and
a WWAN uplink transmit timing. The apparatus 100 further includes a
module 804 that utilizing the clock timing for peer-to-peer
communication with the peer-to-peer resources. The apparatus 100
may include additional modules that perform each of the steps in
the aforementioned flow charts. As such, each step in the
aforementioned flow charts may be performed by a module and the
apparatus 100 may include one or more of those modules.
[0032] Referring to FIG. 1, in one configuration, the apparatus 100
for wireless communication includes means for determining a clock
timing for utilizing resources including peer-to-peer resources
based on a WWAN downlink receive timing and a WWAN uplink transmit
timing. The apparatus 100 further includes means for utilizing the
clock timing for peer-to-peer communication with the peer-to-peer
resources. The apparatus 100 may further include means for
determining the clock timing averages the WWAN downlink receive
timing and the WWAN uplink transmit timing. The apparatus 100 may
further include means for receiving a timing synchronization signal
from a base station, and means for determining the WWAN downlink
receive timing based on the received timing synchronization signal.
The apparatus 100 may further include means for receiving a timing
advance from a base station, and means for determining the WWAN
uplink transmit timing based on the received timing advance. In one
configuration, the resources further include WWAN resources
adjacent to the peer-to-peer resources. In such a configuration,
the apparatus 100 may further include means for receiving a timing
advance from a base station and means for abstaining from using the
peer-to-peer resources for two time periods based on the timing
advance. Each time period of the two time periods is adjacent to
the WWAN resources. The apparatus 100 may further include means for
broadcasting the clock timing. The aforementioned means is the
processing system 114 configured to perform the functions recited
by the aforementioned means.
[0033] It is understood that the specific order or hierarchy of
steps in the processes disclosed is an illustration of exemplary
approaches. Based upon design preferences, it is understood that
the specific order or hierarchy of steps in the processes may be
rearranged. The accompanying method claims present elements of the
various steps in a sample order, and are not meant to be limited to
the specific order or hierarchy presented.
[0034] The previous description is provided to enable any person
skilled in the art to practice the various aspects described
herein. Various modifications to these aspects will be readily
apparent to those skilled in the art, and the generic principles
defined herein may be applied to other aspects. Thus, the claims
are not intended to be limited to the aspects shown herein, but is
to be accorded the full scope consistent with the language claims,
wherein reference to an element in the singular is not intended to
mean "one and only one" unless specifically so stated, but rather
"one or more." Unless specifically stated otherwise, the term
"some" refers to one or more. All structural and functional
equivalents to the elements of the various aspects described
throughout this disclosure that are known or later come to be known
to those of ordinary skill in the art are expressly incorporated
herein by reference and are intended to be encompassed by the
claims. Moreover, nothing disclosed herein is intended to be
dedicated to the public regardless of whether such disclosure is
explicitly recited in the claims. No claim element is to be
construed under the provisions of 35 U.S.C. .sctn.112, sixth
paragraph, unless the element is expressly recited using the phrase
"means for" or, in the case of a method claim, the element is
recited using the phrase "step for."
* * * * *